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lily, the common name applied to herbaceous flowering plants belonging to the genusLilium of the family Liliaceae. The genus contains between 80 and 100 species, native to the temperate areas of the Northern Hemisphere. Lilies are prized as ornamental plants, and they have been extensively hybridized.

The word lily is also used in the common names of many plants of other genera that resemble true lilies. These include the day lily (Hemerocallis) and various species of the family Amaryllidaceae.

The true lilies are erect perennial plants with leafy stems, scaly bulbs, usually narrow leaves, and solitary or clustered flowers. The flowers consist of six petallike segments, which may form the shape of a trumpet, with a more or less elongated tube, as in the Madonna lily (Lilium candidum) and Easter lily (L. longiflorum). Alternatively, the segments may be reflexed (curved back) to form a turban shape, as in the Turk’s cap lily (L. martagon); or they may be less strongly reflexed and form an open cup or bowl shape, as in L. umbellatum and L. auratum. The flowers of some species are quite fragrant, and they occur in a wide variety of colours. Plants of most species range in height from 30 to 120 cm (1–4 feet); plants of certain species, however, exceed 2.5 m (8 feet) in height.

Lilies are among the oldest cultivated plants. In Asia Minor, during the 2nd millennium bc, the bulb of the Madonna lily was cultivated for use in a medicinal ointment; the ancients raised the bulbs of this species for food. The Greeks and Romans grew it for ornamental and medicinal purposes. During the Middle Ages the Madonna lily was associated with the Virgin Mary as a symbol of purity; it is often included in paintings of her. In East Asia various species of lily were grown as food and ornamental plants from an early date.

Lilies are usually raised from bulbs, but they can be grown from seed. Different species vary in the amount of sunlight they require. Most prefer a porous, loamy soil, and good drainage is essential. Most species bloom in July or August. The flowering periods of certain species begin in late spring; others bloom in late summer or early autumn.

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